public static NumberPrototype CreatePrototypeObject(Engine engine, NumberConstructor numberConstructor)
        {
            var obj = new NumberPrototype(engine);

            obj.Prototype      = engine.Object.PrototypeObject;
            obj.PrimitiveValue = 0;
            obj.Extensible     = true;

            obj.FastAddProperty("constructor", numberConstructor, true, false, true);

            return(obj);
        }
        public static NumberConstructor CreateNumberConstructor(Engine engine)
        {
            var obj = new NumberConstructor(engine);

            obj.Extensible = true;

            // The value of the [[Prototype]] internal property of the Number constructor is the Function prototype object
            obj.Prototype       = engine.Function.PrototypeObject;
            obj.PrototypeObject = NumberPrototype.CreatePrototypeObject(engine, obj);

            obj.FastAddProperty("length", 1, false, false, false);

            // The initial value of Number.prototype is the Number prototype object
            obj.FastAddProperty("prototype", obj.PrototypeObject, false, false, false);

            return(obj);
        }